Although I'd like to correct something.
Kubo Tite has been involved in all 3 movies. His level of being involved was limited though, as far as I can remember.
In the 2nd movie, he was quite involved, in fact it was because of him we got to see Hisagi pull of a kidou we've yet to see in the manga yet. (and this was far before he used it in the manga as well, since you've gotta count the movies theater release). He's been involved, it's just that this is the only real time that it's apparently obvious.
Actually it was already confirmed by an interviewer that this is far and away the one he's gotten involved in.
He has confirmed that his only interaction with the Hitsugaya movie was pulling out the tagline "execute Hitsugaya" while he has talked of sitting down working out the entire storyboard with director abe for this movie.
My guess is, the subs will probably come out in either late August or early September, because that was around the time when the subs for the second movie came out last year.
Otherwise, we would probably have to wait for the time when the DVD of that movie is released, and then someone would have to sub it.